Created attachment 167559 [details]
qdbus org.kde.KWin /KWin org.kde.KWin.supportInformation

SUMMARY
Running Wayland here with a two monitor setup. Each screen has an on top panel and both panels have an icon-only task manager widget.
After some days using the desktop I noticed that the icon only task manger widget on the non-primary screen started to show app icons of both the screens even if it is configured to display app icons of the current screen only. Assigning the primary screen in display & monitor to the one where the widget is misbehaving and than back to the original screen solved the issue.

STEPS TO REPRODUCE
1. Have a multimonitor setup with each screen with an on top panel and both panels have an icon-only task manager widget.
2. configure icon-only task manager to show only app icons from the current screen
3. use the desktop from an undefined amount of time

OBSERVED RESULT
After some time the icon-only task manager on the panel of the non-primary screen will start to display app icons from the other screen also.

EXPECTED RESULT
Only the app icons from the current screen should be displayed.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora 39
KDE Plasma Version: 6.0.2
KDE Frameworks Version: 6.0.0
Qt Version: 6.6.2

ADDITIONAL INFORMATION
[goo@goowks ~]$ kscreen-doctor -o
Output: 1 HDMI-A-1
enabled
connected
priority 2
HDMI
Modes:  0:1280x1024@60!  1:1280x1024@75*  2:1280x800@60  3:1152x864@75  4:1280x720@60  5:1024x768@75  6:1024x768@70  7:1024x768@60  8:832x624@75  9:800x600@75  10:800x600@72  11:800x600@60  12:800x600@56  13:640x480@75  14:640x480@73  15:640x480@67  16:640x480@60  17:720x400@70  18:1280x1024@60  19:1024x768@60  20:1280x800@60  21:1280x720@60
Geometry: 1920,88 1280x1024
Scale: 1
Rotation: 1
Overscan: 0
Vrr: incapable
RgbRange: unknown
HDR: incapable
Wide Color Gamut: incapable
ICC profile: none
Output: 2 DP-1
enabled
connected
priority 1
DisplayPort
Modes:  0:1920x1200@60*!  1:1920x1080@60  2:1920x1080@60  3:1920x1080@60  4:1920x1080@50  5:1920x1080@30  6:1920x1080@30  7:1920x1080@25  8:1920x1080@24  9:1920x1080@24  10:1600x1200@60  11:1680x1050@60  12:1280x1024@75  13:1280x1024@60  14:1440x900@60  15:1280x800@60  16:1152x864@75  17:1280x720@60  18:1280x720@60  19:1280x720@60  20:1280x720@50  21:1024x768@75  22:1024x768@60  23:800x600@75  24:800x600@60  25:720x576@50  26:720x480@60  27:720x480@60  28:720x480@60  29:720x480@60  30:720x480@60  31:640x480@75  32:640x480@60  33:640x480@60  34:640x480@60  35:720x400@70  36:1600x1200@60  37:1280x1024@60  38:1024x768@60  39:1280x800@60  40:1920x1080@60  41:1600x900@60  42:1368x768@60  43:1280x720@60
Geometry: 0,0 1920x1200
Scale: 1
Rotation: 1
Overscan: 0
Vrr: incapable
RgbRange: unknown
HDR: incapable
Wide Color Gamut: incapable
ICC profile: none